Montana Resources
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In this photo provided by Montana Resources, a propane-powered noise cannon sits at the edge of the Berkeley Pit in Butte, Montana, on March 3, 2017. The cannon is one of several new measures being taken to keep birds away from the 50 billion gallon toxic pit after 3,000 to 4,000 snow geese died there last fall. (Pete Steilman/Montana Resources, via AP)
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In this Dec. 14, 2016 photo, Montana Resources' Mark Thompson stands on the bank of the Berkeley Pit behind a hut used to watch for birds that try to land in the toxic water in Butte, Mont. Montana Resources is proposing additional technologies such as radars, lasers and drones to prevent another mass death similar to the several thousand snow geese that died in the pit last November. (AP Photo/Matt Volz)
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In this Dec. 14, 2016, photo Mark Thompson of Montana Resources poses for a photo outside the Horseshoe Bend Treatment Plant in Butte, Mont. Thompson says plans to treat toxic Berkeley Pit water at the treatment plant is nothing to be concerned about and that community fears about the plan are overblown. (AP Photo/Matt Volz)
